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A kind of modified polycarbonate type aqueous polyurethane emulsion and preparation method thereof

A technology of water-based polyurethane and polycarbonate type, which is applied in the field of modified polycarbonate water-based polyurethane emulsion and its preparation, and can solve the problems of restricting the development of polycarbonate-type water-based polyurethane and poor acid and alkali resistance

Active Publication Date: 2021-05-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the uniqueness of the emulsion, there are also some problems, such as poor acid and alkali resistance due to the existence of carbonate groups, which limit the development of polycarbonate waterborne polyurethane

Method used

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  • A kind of modified polycarbonate type aqueous polyurethane emulsion and preparation method thereof
  • A kind of modified polycarbonate type aqueous polyurethane emulsion and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a kind of preparation method of modified polycarbonate type waterborne polyurethane, comprises the following steps:

[0047] A) After mixing 50-100 parts by weight of carbon dioxide copolymer polyol, 2-10 parts by weight of small molecule hydrophilic monomers and 20-30 parts by weight of isocyanate, add 0.02-0.3 parts by weight of catalyst, and 1- The neutralizing agent of 5 parts by weight reacts to obtain aqueous polyurethane emulsion;

[0048] B) adding 1 to 20 parts by weight of the nanocellulose aqueous dispersion into the water-based polyurethane emulsion, uniformly dispersed and then adding 0.05 to 5 parts by weight of a small molecule chain extender to obtain a modified solution;

[0049] C) aging the modified solution to obtain a modified polycarbonate type water-based polyurethane emulsion.

[0050] In the present invention, the type, amount and source of each raw material are consistent with the type, amount and source of ...

Embodiment 1

[0064] 60 parts of polycarbonate polyol (Guangdong Dazhi Environmental Protection Technology Co., Ltd., brand 3202h), 2,2,-bismethylolpropionic acid (Aladdin Reagent Co., Ltd.), isophorone diisocyanate (Aladdin Reagent Co., Ltd.) three kinds of medicines were added to the flask in turn, and then the device was installed, and the temperature was started to rise slowly to 60°C, and 0.12 parts of catalyst was added, and the temperature was slowly raised to 85°C, and then kept for 4 hours, and then started to cool down after the heat preservation was completed , when the temperature drops to 50°C, add a solvent to reduce the viscosity of the system, take deionized water, put it on a high-speed disperser, when the temperature drops to 40°C, add 2.5 parts of triethylamine, after 5 minutes, pour the prepolymer into In deionized water, stir for 10 min.

[0065] Take 100 parts of water-based polyurethane emulsion, add 0.4 parts of ethylenediamine, continue to extend the chain on a high...

Embodiment 2

[0068] 60 parts of polycarbonate polyol (Guangdong Dazhi Environmental Protection Technology Co., Ltd., brand 3202h), 2,2,-bismethylolpropionic acid (Aladdin Reagent Co., Ltd.), isophorone diisocyanate (Aladdin Reagent Co., Ltd.) three kinds of medicines were added to the flask in turn, and then the device was installed, and the temperature was started to rise slowly to 60°C, and 0.12 parts of catalyst was added, and the temperature was slowly raised to 85°C, and then kept for 4 hours, and then started to cool down after the heat preservation was completed , when the temperature drops to 50°C, add a solvent to reduce the viscosity of the system, take deionized water, put it on a high-speed disperser, when the temperature drops to 40°C, add 2.5 parts of triethylamine, after 5 minutes, pour the prepolymer into In deionized water, stir for 10 min.

[0069] Take 100 parts of water-based polyurethane emulsion, add 0.4 parts of ethylenediamine, continue to extend the chain on a high...

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Abstract

The invention provides a modified polycarbonate-type water-based polyurethane emulsion and a preparation method thereof. The modified polycarbonate-type water-based polyurethane emulsion is made of the following components in parts by weight: carbon dioxide copolymer polyol: 50~ 100 parts; Small molecule water-based monomer: 2~10 parts; Isocyanate: 20~30 parts; Catalyst: 0.02~0.3 parts; Neutralizer: 1~5 parts; Small molecule chain extender: 0.05~5 parts; Nanofiber Plain water dispersion: 1-20 parts. The nanocellulose used in the present invention can be uniformly dispersed in the water-based polyurethane emulsion. Due to the interaction of hydrogen bonds, a physical network structure is formed, and the water-based polyurethane emulsion is firmly limited by the intermolecular force. At the same time, it is dispersed in the emulsion with a rod-like molecular structure, which plays a role of strengthening and toughening to a certain extent, and improves the mechanical strength and acid resistance of the water-based polyurethane film.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a modified polycarbonate water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Polycarbonate-based water-based polyurethane has good softness, elasticity, hydrolysis resistance, abrasion resistance, higher stretchability, modulus and better weather resistance than polyester-type and polyether-type, and can be formed at room temperature. Film, with good adhesion and certain elasticity, can be used in various aspects of the industry, such as adhesives, coatings, leather paste, wood paint, plastic paint, etc. [0003] However, due to the uniqueness of the emulsion, there are also some problems, such as poor acid and alkali resistance due to the existence of carbonate groups, which limit the development of polycarbonate waterborne polyurethane. In recent years, due to the wide use and promotion of water-based polyurethane, ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/44C08G18/34C08G18/32C08L75/04C08L1/02
CPCC08G18/3228C08G18/348C08G18/44C08G18/6651C08G18/6659C08L75/04C08L1/02
Inventor 陈熙宋丽娜刘保华李昭符宗可朱炜健程梦萍
Owner GUANGDONG UNIV OF TECH